WO2021186947A1 - Batterie secondaire à électrolyte non aqueux - Google Patents

Batterie secondaire à électrolyte non aqueux Download PDF

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Publication number
WO2021186947A1
WO2021186947A1 PCT/JP2021/004628 JP2021004628W WO2021186947A1 WO 2021186947 A1 WO2021186947 A1 WO 2021186947A1 JP 2021004628 W JP2021004628 W JP 2021004628W WO 2021186947 A1 WO2021186947 A1 WO 2021186947A1
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WO
WIPO (PCT)
Prior art keywords
positive electrode
current collector
electrode
radius
tab
Prior art date
Application number
PCT/JP2021/004628
Other languages
English (en)
Japanese (ja)
Inventor
達也 津島
尚士 細川
Original Assignee
三洋電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Priority to CN202180012548.6A priority Critical patent/CN115039285A/zh
Priority to JP2022508126A priority patent/JPWO2021186947A1/ja
Priority to EP21770428.7A priority patent/EP4123820A4/fr
Priority to US17/802,321 priority patent/US20230091100A1/en
Publication of WO2021186947A1 publication Critical patent/WO2021186947A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • This disclosure relates to a non-aqueous electrolyte secondary battery.
  • a group of tabs extending from an electrode body housed in a square exterior body is connected to an external terminal provided on a sealing plate via a current collector. It has been known.
  • Patent Document 1 is a collection composed of a base portion arranged between the sealing plate and the electrode body, and legs extending from the end portion of the base base portion toward the bottom along the side wall of the exterior body.
  • the electrical body is disclosed.
  • the base portion is connected to the external terminal, and the leg portion is connected to the electrode plate laminated portion (tab group) drawn out from the electrode body.
  • the secondary battery according to the present disclosure includes an electrode body including an electrode plate, a square exterior body having an opening and accommodating the electrode body, a sealing plate that seals the opening, and an electrode provided on the sealing plate.
  • the terminal is arranged between the electrode body and the sealing plate, and is arranged between the first current collector connected to the electrode terminal, the electrode body, and the side wall of the square exterior body, and is described above.
  • a tab formed by stacking a second current collector connected to the first current collector and a plurality of electrode tabs extending from the electrode plate to the side wall side, and connected to the second current collector.
  • the second current collector is composed of a flat plate having a surface parallel to the side wall, and the tab group is bent parallel to the side wall on the connection portion side with the second side wall.
  • Each of the electrode tabs has a radius-shaped first radius portion provided at each corner on both sides in the width direction of the base portion with the electrode plate, and corners on both sides in the width direction of the tip portion in the extension direction.
  • Each portion has a rounded second rounded portion, and the radius of curvature of the first rounded portion is larger than the radius of curvature of the second rounded portion.
  • FIG. 1 is a perspective view showing a non-aqueous electrolyte secondary battery.
  • FIG. 2 is a cross-sectional view showing the internal structure of the non-aqueous electrolyte secondary battery.
  • FIG. 3 is a diagram showing the vicinity of the connection portion between the second current collector and the tab group before bending the tab group.
  • FIG. 4 is a diagram showing the vicinity of the connection portion between the second current collector and the tab group after the tab group is bent.
  • FIG. 5 is a diagram showing an electrode tab extending from the electrode plate according to the present embodiment.
  • FIG. 6 is a diagram showing a second current collector.
  • FIG. 7 is a diagram showing a group of electrode bodies including a plurality of electrode bodies.
  • FIG. 8 is a diagram showing details of the electrode tab according to the present embodiment.
  • FIG. 9 is a diagram schematically showing the flow of current flowing from the electrode plate to the electrode tab according to the present embodiment.
  • FIG. 10 is a diagram showing an electrode tab extending from the electrode plate according to the previous application.
  • FIG. 11 is a diagram showing details of the electrode tab according to the previous application.
  • FIG. 12 is a diagram schematically showing the flow of current flowing from the electrode plate to the electrode tab according to the previous application.
  • Non-aqueous electrolyte secondary battery according to the previous application
  • the applicant of the present application discloses the structure of the non-aqueous electrolyte secondary battery in the specification of the previous application (Japanese Patent Application No. 2019-174878).
  • the non-aqueous electrolyte secondary battery 20 disclosed in the above specification is a tab of the electrode body 3 including the electrode plates (positive electrode plate 4 and negative electrode plate 5) housed in the square exterior body 1.
  • the group 40 and the electrode terminal 8 provided on the sealing plate 2 are electrically connected to each other by the first current collector 61 and the second current collector 62.
  • the first current collector 61 is arranged between the electrode body 3 and the sealing plate 2 and is connected to the electrode terminal 8.
  • the second current collector 62 is arranged between the electrode body 3 and the side wall 1b of the square exterior body 1, is composed of a flat plate having a surface parallel to the side wall 1b, and is connected to the first current collector 61.
  • the tab group 40 is laminated with a plurality of electrode tabs (for example, positive electrode tab 41) extending from one end side 4a on one side in the lateral direction of the electrode plate (for example, positive electrode plate 4). It is formed by As shown in FIG. 3, the tab group 40 extends from the electrode body 3 to the side wall 1b side and is connected to the second current collector 62. As shown in FIG. 4, the tab group 40 is bent parallel to the side wall 1b on the connection portion 63 side with the second current collector 62.
  • electrode tabs for example, positive electrode tab 41
  • the tab group 40 can be bent without bending the second current collector 62. Thereby, a non-aqueous electrolyte secondary battery having a high volumetric energy density can be produced by a simple method.
  • the inventors of the present application have further improved the non-aqueous electrolyte secondary battery to set the radius of curvature of the corners on both sides in the width direction of the base portion of each electrode tab with the electrode plate in the width direction of the tip portion of each electrode tab. It was made larger than the radius of curvature of the corners on both sides. This makes it possible to relax the current concentration and stress concentration at the corners on both sides in the width direction of the base of the electrode tab and the electrode plate while ensuring the welding stability between the tab group and the second current collector. bottom.
  • FIG. 1 is a perspective view showing a non-aqueous electrolyte secondary battery 20 according to the embodiment of the present disclosure.
  • FIG. 2 is a cross-sectional view showing the internal structure of the non-aqueous electrolyte secondary battery 20.
  • the non-aqueous electrolyte secondary battery 20 is a battery composed of a bottomed square cylindrical outer body 1 having an opening and a sealing plate 2 for sealing the opening of the square outer body 1.
  • a case 100 is provided.
  • the square exterior body 1 has a bottom portion 1a, a pair of first side walls 1b and 1c, and a pair of second side walls 1d and 1e.
  • the pair of first side walls 1b and 1c are arranged so as to face each other.
  • the pair of second side walls 1d and 1e are arranged so as to face each other.
  • the pair of first side walls 1b and 1c are perpendicular to the longitudinal direction of the sealing plate 2, and the area of the pair of first side walls 1b and 1c is smaller than the area of the pair of second side walls 1d and 1e.
  • an electrode body 3 including a positive electrode plate 4 and a negative electrode plate 5 as electrode plates is housed together with an electrolyte.
  • the electrode body 3 is a flat electrode body in which a positive electrode plate 4 and a negative electrode plate 5 are wound around a separator.
  • the winding axis of the electrode body 3 extends perpendicular to the first side walls 1b and 1c and parallel to the second side walls 1d and 1e.
  • the electrode body 3 is not limited to the wound electrode body, and may be, for example, a laminated electrode body in which a positive electrode plate 4 and a negative electrode plate 5 are laminated via a separator.
  • reference numeral 14 is a box-shaped or bag-shaped insulating sheet arranged inside the square exterior body 1 and accommodating the electrode body 3.
  • Reference numeral 15 is an electrolytic solution injection hole provided in the sealing plate 2.
  • Reference numeral 16 is a sealing member for sealing the electrolytic solution injection hole 15.
  • Reference numeral 17 is a gas discharge valve provided on the sealing plate 2.
  • one side is the positive electrode side and the other side is the negative electrode side in the direction in which the winding shaft of the electrode body 3 extends.
  • the positive electrode side will be mainly described, and the description of the negative electrode side may be omitted.
  • a positive electrode tab group 40 is provided at one end in the direction in which the winding shaft extends. Specifically, the positive electrode tab group 40 extends from one end of the electrode body 3 toward the first side wall 1b.
  • the positive electrode tab group 40 is formed by laminating positive electrode tabs 41, 41, ... As a plurality of electrode tabs.
  • the positive electrode plate 4 has a long strip shape and is formed in a substantially rectangular shape.
  • the positive electrode plate 4 has a region in which the positive electrode active material layers 4b are formed on both sides of the positive electrode core body.
  • the positive electrode tab 41 is composed of an exposed portion of the positive electrode core.
  • a positive electrode protective layer having a lower conductivity than the positive electrode active material layer 4b is provided at the root portion of the positive electrode tab 41, that is, the base portion 42 with the positive electrode plate 4. It is not necessary to provide the positive electrode protective layer. The details of the shape of the positive electrode tab (electrode tab) 41 will be described later.
  • each positive electrode tab 41 extends from the positive electrode plate 4 toward the first side wall 1b.
  • the sealing plate 2 is provided with a positive electrode terminal 8 as an electrode terminal.
  • the positive electrode terminal 8 is electrically connected to the positive electrode tab group 40 via the positive electrode current collector 6.
  • the positive electrode current collector 6 is composed of a first positive electrode current collector 61 and a second positive electrode current collector 62.
  • the first positive electrode current collector 61 has a substantially L-shaped cross section and is arranged between the electrode body 3 and the sealing plate 2. Specifically, the first positive electrode current collector 61 has a first region arranged along the sealing plate 2 and a second region bent from an end portion of the first region. The second region extends toward the bottom 1a along the first side wall 1b. The first positive electrode current collector 61 is connected to the positive electrode terminal 8.
  • the second positive electrode current collector 62 is arranged between the electrode body 3 and the first side wall 1b of the square exterior body 1. Specifically, the second positive electrode current collector 62 is made of a flat plate having a surface parallel to the first side wall 1b, and extends along the first side wall 1b toward the bottom portion 1a. The second positive electrode current collector 62 is connected to the first positive electrode current collector 61.
  • FIG. 6 shows the second positive electrode current collector 62.
  • the second positive electrode current collector 62 has a current collector connecting portion 62a, an inclined portion 62b, and a tab connecting portion 62c.
  • the current collector connecting portion 62a is connected to the first positive electrode current collector 61.
  • the positive electrode tab group 40 is connected to the tab connection portion 62c.
  • the inclined portion 62b connects the current collector connecting portion 62a and the tab connecting portion 62c, and is inclined with respect to both.
  • the current collector connecting portion 62a is provided with a recess 62d.
  • the recess 62d is provided with a through hole 62e. In the recess 62d, the current collector connecting portion 62a is joined to the first positive electrode current collector 61.
  • the second positive electrode current collector 62 is provided with a fuse portion 66.
  • FIG. 3 shows the vicinity of the connection portion between the second positive electrode current collector 62 and the positive electrode tab group 40 before bending the positive electrode tab group 40.
  • the positive electrode tab group 40 is connected to the tab connection portion 62c of the second positive electrode current collector 62. Specifically, as shown in FIG. 3, before the positive electrode tab group 40 is bent, the positive electrode tab group 40 is arranged on the tab connection portion 62c of the second positive electrode current collector 62, and the tab connection portion 62c and the positive electrode tab group 40 are arranged.
  • the connecting portion 63 is formed by joining (welding) the positive electrode tab group 40.
  • the positive electrode tab group 40 is connected to the tab connection portion 62c of the second positive electrode current collector 62 toward one side in the width direction (right side in FIG. 3) of the flat plate. That is, the connecting portion 63 between the positive electrode tab group 40 and the tab connecting portion 62c is closer to the root side (one side in the width direction, right side in FIG. 3) of the positive electrode tab group 40 in the width direction of the flat plate. As a result, when the positive electrode tab group 40 is bent, a curved shape can be more reliably formed in the vicinity of the root of the positive electrode tab group 40.
  • the positive electrode tab group 40 may be connected to the tab connection portion 62c of the second positive electrode current collector 62 at the center in the width direction of the flat plate.
  • FIG. 4 shows the vicinity of the connection portion between the second positive electrode current collector 62 and the positive electrode tab group 40 after the positive electrode tab group 40 is bent.
  • the tab connection portion 62c of the second positive electrode current collector 62 which is arranged substantially parallel to the first main surface 3a and the second main surface 3b of the electrode body 3, is bent into the positive electrode tab group 40.
  • the orientation is substantially perpendicular to the winding axis of the electrode body 3. That is, the positive electrode tab group 40 is bent parallel to the first side wall 1b on the connection portion 63 side with the second positive electrode current collector 62.
  • the bent positive electrode tab group 40 is fixed to the electrode body 3 by the tape 80.
  • the non-aqueous electrolyte secondary battery 20 includes a plurality of electrode bodies 3.
  • a second positive electrode current collector 62 is connected to the positive electrode tab group 40 of each electrode body 3.
  • the electrode body group 300 is formed by arranging a plurality of electrode bodies 3 and fixing them together with tape.
  • the second positive electrode current collector 62 provided in each electrode body 3 is connected to one first positive electrode current collector 61 provided in the sealing plate 2, respectively.
  • the positive electrode tab 41 on the positive electrode side will be described as an example, and the description of the negative electrode tab on the negative electrode side will be omitted.
  • FIG. 8 shows the details of the positive electrode tab 41 according to this embodiment.
  • each positive electrode tab 41 extends from one end side 4a of the substantially rectangular positive electrode plate 4 in the lateral direction (winding axis direction).
  • Each positive electrode tab 41 extends so as to be orthogonal to the end side 4a of the positive electrode plate 4.
  • Each positive electrode tab 41 has a substantially quadrangular shape. Specifically, each positive electrode tab 41 has a long side as a side 42a (lower bottom) on the base portion 42 side with the positive electrode plate 4, and a short side as a side 45a (upper bottom) on the tip portion 45 side in the extending direction. It has a substantially trapezoidal shape.
  • the tip side 45a of each positive electrode tab 41 is parallel to the end side 4a of the positive electrode plate 4.
  • R-shaped first rounded portions 44, 44 are provided at each of the corner portions 43, 43 on both sides in the width direction of the base portion 42 with the positive electrode plate 4 in each positive electrode tab 41.
  • the first rounded portion 44 is formed in a convex arc shape on the positive electrode plate 4 side.
  • the first radius portion 44 is provided to relax the current concentration and the stress concentration in the corner portion 43.
  • the radius of curvature R1 of the first rounded portion 44 is preferably, for example, 5 mm or more.
  • each of the corner portions 46, 46 on both sides in the width direction of the tip portion 45 in the extending direction of each positive electrode tab 41 is provided with rounded second rounded portions 47, 47.
  • the second rounded portion 47 is formed in a convex arc shape on the side opposite to the positive electrode plate 4. It is indispensable to provide the second radius portion 47 to smooth the corner portion 46 from the viewpoint of safety when the operator comes into contact with the corner portion 46.
  • the radius of curvature R2 of the second rounded portion 47 is preferably, for example, 1 mm or more and 2 mm or less.
  • the radius of curvature R1 of the first radius portion 44 is larger than the radius of curvature R2 of the second radius portion 47.
  • the radius of curvature R1'on the root portion 42 side and the radius of curvature R2' on the tip portion 45 side are substantially the same size.
  • reference numeral B1 is a width dimension including the first rounded portions 44, 44 of the root portion 42.
  • Reference numeral b1 is a width dimension excluding the first rounded portions 44, 44 of the root portion 42.
  • Reference numeral B2 is a width dimension including the second rounded portions 47, 47 of the tip portion 45.
  • Reference numeral b2 is a width dimension excluding the second rounded portions 47, 47 of the tip portion 45.
  • the hatched portion is the welding range 48 between the positive electrode tab group 40 and the second positive electrode current collector 62.
  • the width dimension B3 of the welding range 48 substantially coincides with the width dimension b2 of the tip portion 45 excluding the second rounded portions 47 and 47.
  • the radius of curvature R1 of the first radius portion 44 on the root portion 42 side and the radius of curvature R2 of the second radius portion 47 on the tip portion 45 side may be the same.
  • the radius of curvature R1 on the base portion 42 side is made larger than the radius of curvature R2 on the tip portion 45 side.
  • the radius of curvature R1'on the root portion 42 side and the radius of curvature R2' on the tip portion 45 side are substantially the same (see FIG. 11), as compared with the case where the radius of curvature R1'on the root portion 42 side is substantially the same.
  • the radius of curvature R1 can be increased.
  • the radius of curvature R1 on the root portion 42 side can be increased, so that the current F flowing along the end side 4a of the positive electrode plate 4 is transferred as shown in FIG. It can be smoothly flowed into the positive electrode tab 41. As a result, it is possible to alleviate the occurrence of current concentration at the corners 43 on both sides of the base portion 42 in the width direction.
  • the non-aqueous electrolyte secondary battery 20 according to the present embodiment has a large weight and a large load applied to the positive electrode tab 41 because the dead space is reduced and the volumetric energy density is increased. Therefore, it is effective to adopt the stress concentration relaxation structure.
  • the current concentration at the corners 43 on both sides in the width direction of the base portion 42 can be further relaxed.
  • the current density (mA / mm 2 ) at the corner 43 is reduced by 10% or more as compared with the case where the radius of curvature R1 is 2 mm.
  • the stress concentration at the corner portions 43 on both sides in the width direction of the base portion 42 can be further relaxed.
  • the stress (N / mm 2 ) at the corner 43 is reduced by 20% or more as compared with the case where the radius of curvature R1 is 2 mm.
  • the positive electrode tab 41 substantially trapezoidal, for example, the current F flowing along the end side 4a of the positive electrode plate 4 flows more smoothly into the positive electrode tab 41 as compared with the case where the positive electrode tab 41 has a substantially rectangular shape. Can be made to.
  • the negative electrode side has the same configuration as the positive electrode side.
  • reference numeral 9 is a negative electrode terminal
  • reference numeral 50 is a negative electrode tab group
  • reference numeral 7 is a negative electrode current collector
  • reference numeral 71 is a first negative electrode current collector and reference numeral 72.
  • Reference numeral 12 indicates a second negative electrode current collector
  • reference numeral 12 indicates an external insulating member
  • reference numeral 13 indicates an internal insulating member.
  • reference numeral 72a is a current collector connection portion
  • reference numeral 72b is an inclined portion
  • reference numeral 72c is a tab connection portion.
  • the above structure in which the radius of curvature R1 on the base portion 42 side is larger than the radius of curvature R2 on the tip portion 45 side may be adopted for both the positive electrode tab and the negative electrode tab, or may be adopted for only one of them. good.
  • each electrode tab has a substantially trapezoidal shape, but the present invention is not limited to this.
  • Each electrode tab may have, for example, a substantially square shape, a substantially rectangular shape, or another substantially square shape.
  • each electrode tab is not limited to a substantially quadrangular shape, and corners are provided on both sides in the width direction of the base portion with the electrode plate, and corner portions are provided on both sides in the width direction of the tip portion in the extension direction. If, it may be a substantially polygonal shape of a pentagon or more.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne une batterie secondaire comprenant : un corps d'électrode comprenant une plaque d'électrode ; un corps extérieur carré contenant le corps d'électrode ; une plaque d'étanchéité ; une borne d'électrode disposée sur la plaque d'étanchéité ; un premier collecteur de courant disposé entre le corps d'électrode et la plaque d'étanchéité et connecté à la borne d'électrode ; un second collecteur de courant qui est disposé entre le corps d'électrode et une paroi latérale du corps extérieur carré et qui est relié au premier collecteur de courant ; et un groupe de languettes qui est formé par empilement d'une pluralité de languettes s'étendant à partir de la plaque d'électrode vers la paroi latérale et est relié au second collecteur de courant. Le groupe de languettes est relié au second collecteur de courant, et est courbé parallèlement à la paroi latérale sur le coté de la partie de connexion avec le second collecteur de courant. Le rayon de courbure d'une première partie arrondie de la partie de base de chaque languette est supérieur au rayon de courbure d'une seconde partie arrondie de la partie pointe de chaque languette.
PCT/JP2021/004628 2020-03-17 2021-02-08 Batterie secondaire à électrolyte non aqueux WO2021186947A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN202180012548.6A CN115039285A (zh) 2020-03-17 2021-02-08 非水电解质二次电池
JP2022508126A JPWO2021186947A1 (fr) 2020-03-17 2021-02-08
EP21770428.7A EP4123820A4 (fr) 2020-03-17 2021-02-08 Batterie secondaire à électrolyte non aqueux
US17/802,321 US20230091100A1 (en) 2020-03-17 2021-02-08 Non-aqueous electrolyte secondary battery

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Application Number Priority Date Filing Date Title
JP2020-046316 2020-03-17
JP2020046316 2020-03-17

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WO2021186947A1 true WO2021186947A1 (fr) 2021-09-23

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US (1) US20230091100A1 (fr)
EP (1) EP4123820A4 (fr)
JP (1) JPWO2021186947A1 (fr)
CN (1) CN115039285A (fr)
WO (1) WO2021186947A1 (fr)

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JP7198253B2 (ja) * 2020-11-10 2022-12-28 プライムプラネットエナジー＆ソリューションズ株式会社 電池
CN116779986A (zh) * 2023-08-18 2023-09-19 深圳海辰储能控制技术有限公司 储能装置与用电设备

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013031891A1 (fr) * 2011-08-31 2013-03-07 Ｎｅｃエナジーデバイス株式会社 Batterie rechargeable à électrolyte non aqueux
JP2014022116A (ja) * 2012-07-13 2014-02-03 Shin Kobe Electric Mach Co Ltd 二次電池用極板及び二次電池用極板の製造方法
JP2016085875A (ja) 2014-10-27 2016-05-19 株式会社Ｇｓユアサ 蓄電素子、電源モジュール及び蓄電素子の製造方法
JP2017050069A (ja) * 2015-08-31 2017-03-09 株式会社豊田自動織機 蓄電装置
CN207441852U (zh) * 2017-11-29 2018-06-01 宁德时代新能源科技股份有限公司 极片卷材、电极组件及二次电池
JP2018133306A (ja) * 2017-02-17 2018-08-23 リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフトＬｉｔｈｉｕｍ Ｅｎｅｒｇｙ ａｎｄ Ｐｏｗｅｒ ＧｍｂＨ ＆ Ｃｏ． ＫＧ 蓄電素子
JP2019061779A (ja) * 2017-09-25 2019-04-18 パナソニック株式会社 蓄電装置及び蓄電装置の製造方法
WO2019088053A1 (fr) * 2017-10-30 2019-05-09 株式会社東芝 Batterie et procédé permettant de fabriquer une batterie
JP2019174878A (ja) 2018-03-27 2019-10-10 日本電気株式会社 情報処理装置、情報処理方法および情報処理プログラム

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2452143Y (zh) * 2000-11-24 2001-10-03 江苏双登电源有限公司 阀控密封铅酸蓄电池板栅
CN102324573B (zh) * 2011-09-02 2014-06-04 深圳市格瑞普电池有限公司 极片以及叠片锂离子电池
CN202454660U (zh) * 2012-02-25 2012-09-26 佛山市顺德区精锐电池科技有限公司 高承载力锂电池极片
CN204991848U (zh) * 2015-08-13 2016-01-20 重庆创祥电源有限公司 蓄电池板栅
JP7087488B2 (ja) * 2018-03-14 2022-06-21 三洋電機株式会社 非水電解質二次電池及びそれを用いた組電池
CN208819970U (zh) * 2018-10-26 2019-05-03 宁德时代新能源科技股份有限公司 二次电池

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013031891A1 (fr) * 2011-08-31 2013-03-07 Ｎｅｃエナジーデバイス株式会社 Batterie rechargeable à électrolyte non aqueux
JP2014022116A (ja) * 2012-07-13 2014-02-03 Shin Kobe Electric Mach Co Ltd 二次電池用極板及び二次電池用極板の製造方法
JP2016085875A (ja) 2014-10-27 2016-05-19 株式会社Ｇｓユアサ 蓄電素子、電源モジュール及び蓄電素子の製造方法
JP2017050069A (ja) * 2015-08-31 2017-03-09 株式会社豊田自動織機 蓄電装置
JP2018133306A (ja) * 2017-02-17 2018-08-23 リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフトＬｉｔｈｉｕｍ Ｅｎｅｒｇｙ ａｎｄ Ｐｏｗｅｒ ＧｍｂＨ ＆ Ｃｏ． ＫＧ 蓄電素子
JP2019061779A (ja) * 2017-09-25 2019-04-18 パナソニック株式会社 蓄電装置及び蓄電装置の製造方法
WO2019088053A1 (fr) * 2017-10-30 2019-05-09 株式会社東芝 Batterie et procédé permettant de fabriquer une batterie
CN207441852U (zh) * 2017-11-29 2018-06-01 宁德时代新能源科技股份有限公司 极片卷材、电极组件及二次电池
JP2019174878A (ja) 2018-03-27 2019-10-10 日本電気株式会社 情報処理装置、情報処理方法および情報処理プログラム

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4123820A4

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